Question

I got a view model like this:

 public class BaseViewModelTech : INotifyPropertyChanged
{


    static string _TechnicianID;
    public string TechnicianID
    {
        get {                
            return _TechnicianID;
        }
        set {

            _TechnicianID = TechnicianID; 
            OnPropertyChanged("TechnicianID");
        }

    }

    static string _DeviceID;
    public string DeviceID
    {
        get
        {
            return _DeviceID;
        }
        set
        {
            _DeviceID = DeviceID;
            OnPropertyChanged("DeviceID");
        }

    }



    // In ViewModelBase.cs
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        this.VerifyPropertyName(propertyName);

        PropertyChangedEventHandler handler = this.PropertyChanged;
        if (handler != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            handler(this, e);
        }
    }

    [Conditional("DEBUG")]
    [DebuggerStepThrough]
    public void VerifyPropertyName(string propertyName)
    {
        // Verify that the property name matches a real,  
        // public, instance property on this object.
        if (TypeDescriptor.GetProperties(this)[propertyName] == null)
        {
            string msg = "Invalid property name: " + propertyName;
            Debug.Fail(msg);
        }
    }
}

I send it as parameter to my xaml.cs

 public partial class BaseView   : Window{
  BaseViewModelTech  viewModel; 
        public BaseView  (BaseViewModelTech   vm)
        {
            InitializeComponent();
            viewModel = vm;
        }}

what do I write to access it throught xaml using binding?? I failed to understand multiple examples.

Answer 1

Change your code behind of your view slightly:

public partial class BaseView   : Window
{
    BaseViewModelTech  viewModel; 

    public BaseView  (BaseViewModelTech   vm)
    {
        InitializeComponent();
        viewModel = vm;
        this.DataContext = vm;   // <----------- add this
    }
}

And then in your XAML you can have something like this:

<TextBlock Text="{Binding TechnicianID}" />

Also note that in your setters you want to do the notification after the property value is changed, not before:

    set
    {
        _DeviceID = DeviceID;
        OnPropertyChanged("DeviceID");  // <------ this goes after the member variable change
    }